Type in what each corner reads, set a target, and this works out how much ballast to add and
which corners to put it on. Built around what a drag car cares about — rear bias, left-side
weight and cross weight. It runs entirely in your browser; nothing is stored unless you export
a CSV.
Current scale weights
What each pad reads (lb)
Car at race weight, driver in it, level pads, running tire pressures.
The car, with ballast applied
Front of the car is at the top. Figures include any ballast entered below.
Distribution
As weighed
With ballast
Change
Targets & ballast
What you are aiming for
Cross weight--
Left side--
Rear bias--
Read one at a time. Each recommendation is worked out from the bare scale
weights on its own, and the three pull against each other — ballast that fixes cross
weight also moves left-side and rear. Set the one that matters most, put the numbers into
the planner below, and see what it did to the others.
Ballast planner
Ballast you intend to bolt in, at each corner (lb).
Ballast used--
Cross vs target--
Left vs target--
Rear vs target--
Nothing is saved until you press that. The export is generated in the browser
and downloaded straight to your device — it is never uploaded.
Scale-pad math only. It assumes the car is level, at race weight with the driver
aboard, and sitting on its running tire pressures — if any of that is off, so are the
numbers. And cross weight moved with ballast is not the same as cross weight moved with
spring preload: the diagonal percentage will match, the ride heights will not.